Tesseral
Open source auth infrastructure for B2B SaaS
...It is not an authentication library tied to a particular language or framework; Tesseral works with any tech stack. Tesseral is open source auth infrastructure for business software (i.e., B2B SaaS). Tesseral is built for B2B SaaS. Your customer's admins control how their users log in to their tenant, and can add or remove users at will.